// 封装倒计时函数
import { ref, computed, onUnmounted } from 'vue'

import dayjs from 'dayjs'

export const useCountDown = () => {
    const time = ref(0)
    const formaTime = computed(()=>dayjs.unix(time.value).format('mm分ss秒'))
    let timer = null
    const start = (currentTime) => {
        time.value = currentTime
        timer = setInterval(() => {
            time.value--
        },1000)
    }
    // 组件销毁是清除定时器
    onUnmounted(() => {
        timer && clearInterval(timer)
    })
    return {
        formaTime,
        start
    }
}